[Danrich]

What's the last software update to help the ZF 9HP transmission to not reeve after de-acceleration on the latest models ?
And is there a software update bulletin page ?
Thanks

 

[Farther]

I don't think there has been a TSB for the 9 speed since October 2020. What year is your Ridgeline?

 

[slomtbr]

I don't think there has been a TSB for the 9 speed since October 2020. What year is your Ridgeline?

https://www.ridgelineownersclub.com/threads/2025-revving-after-taking-foot-off-gas-pedal.246400/?post_id=3436761#post-3436761

 

[slomtbr]

The rev-matching isn't going away.

 

[Farther]

It seems that this question has been asked and answered several times before.

 

[Shoulder]

The rev-matching isn't going away.

Yup.

And as I understand it, it is a required quirk of the engine due to the use of dog clutches for two of the gears. Otherwise, I think it will put undue stress on the components. It's no different than rev-matching a manual transmission. Sure, you can do it without, but you'll put more stress on the components, plus get that infamous lurch in the process. Not great.